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PIC16F877 Analog/Digital Inputs

 
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DonWare



Joined: 18 Jan 2006
Posts: 43

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PIC16F877 Analog/Digital Inputs
PostPosted: Wed Apr 04, 2007 1:13 pm     Reply with quote
Hi, I was wondering if it might be possible to set all ANx inputs for analog but still use some for digital input only ?

I have a circuit here that uses AN0,1 for analog input and then RA3,4,5 for digital input. I'm not clear about which constant to use for SETUP_ADC_PORTS().

I'd appreciate any ideas.
Thanks. Don
PCM programmer



Joined: 06 Sep 2003
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PostPosted: Wed Apr 04, 2007 1:42 pm     Reply with quote
Only certain combinations of analog and digital pins are allowed by
the PIC hardware. See this thread:
http://www.ccsinfo.com/forum/viewtopic.php?t=30320&highlight=analog&start=5
adrian



Joined: 08 Sep 2003
Posts: 92
Location: Glasgow, UK

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PostPosted: Thu Apr 05, 2007 5:36 am     Reply with quote
One way around this type of problem is to read the analogue voltage of the digital input, then compare the analogue reading with the expected equivalent logic high/low digital value.
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